ArmPlatformPkg/ArmVirtualizationPkg/Library/PlatformPeiLib/PlatformPeiLib.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2011-2014, ARM Limited. All rights reserved.
   4 *  Copyright (c) 2014, Linaro Limited. All rights reserved.
   5 *
   6 *  This program and the accompanying materials
   7 *  are licensed and made available under the terms and conditions of the BSD License
   8 *  which accompanies this distribution.  The full text of the license may be found at
   9 *  http://opensource.org/licenses/bsd-license.php
  10 *
  11 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13 *
  14 **/
  15
  16 #include <PiPei.h>
  17
  18 #include <Library/MemoryAllocationLib.h>
  19 #include <Library/DebugLib.h>
  20 #include <Library/HobLib.h>
  21 #include <Library/PcdLib.h>
  22 #include <libfdt.h>
  23
  24 #include <Guid/EarlyPL011BaseAddress.h>
  25 #include <Guid/FdtHob.h>
  26
  27 EFI_STATUS
  28 EFIAPI
  29 PlatformPeim (
  30   VOID
  31   )
  32 {
  33   VOID               *Base;
  34   VOID               *NewBase;
  35   UINTN              FdtSize;
  36   UINTN              FdtPages;
  37   UINT64             *FdtHobData;
  38   UINT64             *UartHobData;
  39   INT32              Node, Prev;
  40   CONST CHAR8        *Compatible;
  41   CONST CHAR8        *CompItem;
  42   INT32              Len;
  43   CONST UINT64       *RegProp;
  44   UINT64             UartBase;
  45
  46
  47   Base = (VOID*)(UINTN)PcdGet64 (PcdDeviceTreeInitialBaseAddress);
  48   ASSERT (Base != NULL);
  49   ASSERT (fdt_check_header (Base) == 0);
  50
  51   FdtSize = fdt_totalsize (Base) + PcdGet32 (PcdDeviceTreeAllocationPadding);
  52   FdtPages = EFI_SIZE_TO_PAGES (FdtSize);
  53   NewBase = AllocatePages (FdtPages);
  54   ASSERT (NewBase != NULL);
  55   fdt_open_into (Base, NewBase, EFI_PAGES_TO_SIZE (FdtPages));
  56
  57   FdtHobData = BuildGuidHob (&gFdtHobGuid, sizeof *FdtHobData);
  58   ASSERT (FdtHobData != NULL);
  59   *FdtHobData = (UINTN)NewBase;
  60
  61   UartHobData = BuildGuidHob (&gEarlyPL011BaseAddressGuid, sizeof *UartHobData);
  62   ASSERT (UartHobData != NULL);
  63   *UartHobData = 0;
  64
  65   //
  66   // Look for a UART node
  67   //
  68   for (Prev = 0;; Prev = Node) {
  69     Node = fdt_next_node (Base, Prev, NULL);
  70     if (Node < 0) {
  71       break;
  72     }
  73
  74     //
  75     // Check for UART node
  76     //
  77     Compatible = fdt_getprop (Base, Node, "compatible", &Len);
  78
  79     //
  80     // Iterate over the NULL-separated items in the compatible string
  81     //
  82     for (CompItem = Compatible; CompItem != NULL && CompItem < Compatible + Len;
  83       CompItem += 1 + AsciiStrLen (CompItem)) {
  84
  85       if (AsciiStrCmp (CompItem, "arm,pl011") == 0) {
  86         RegProp = fdt_getprop (Base, Node, "reg", &Len);
  87         ASSERT (Len == 16);
  88
  89         UartBase = fdt64_to_cpu (ReadUnaligned64 (RegProp));
  90
  91         DEBUG ((EFI_D_INFO, "%a: PL011 UART @ 0x%lx\n", __FUNCTION__, UartBase));
  92
  93         *UartHobData = UartBase;
  94         break;
  95       }
  96     }
  97   }
  98
  99   BuildFvHob (PcdGet64 (PcdFvBaseAddress), PcdGet32 (PcdFvSize));
 100
 101   return EFI_SUCCESS;
 102 }